Reproducer for talking-machines



J. W. KAUFMANN.

REPRODUCER FOR TALKING MACHINES.

APPLICATION FILED JUNE 9, I920.

1,381,998. PatentedJuneZl, 1921.

INVENTOIII WE Johnfw Kauf'mann W ATTORNEYS WITNESSES I the lever. openings in ts ends, which are engagedby UNITED STATES PATENT OFFICE.

JOHN W. KAUFMANN, OF BALTIMORE, MARYLAND.

REPRODUGER FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented June 21, 1921-.

Application filed Tune 9, 1920. Serial No. 387,640.

producers for talking machines, and has for its object to provide a new and improved connection between 'the'needleand the diaphragm controlling lever for transmitting in as perfect a manner as possible the movement of the needle to the diaphragm, top'rovide for asoftening of'the tone and elimination of mechanical elements therefrom, as

well as for increasing the volume of tone.

"In the drawings: Flgure 1 1s a perspectlve new of the improved reproducer;

Fig.2 is a front View; Fig. 3 is a section on the line 3- 3 of Fig. 2.

In the embodiment of the invention shown,'the case 1 ofthereproducer box has the usual central nipple 2, for receiving the inlet end Of the amplifier'3. The diaphragm 4 is of any usualy-or desired construction, being held in place'in the case by means of gaskets 5, the said gaskets being formed from rubber orYthe like, preferably tubing, as shown. A ring 6 is secured to the case to hold the gasket-s andthediaphragm in place and the reproducing l'ever '7 is connected with "the center of the diaphragm in the usual manner.

The case 1 of the reproducer box has a radial extension at oneside, indicated at 8,

the said extension in the present instance having two bearings 9,'through which are threaded's'e't screws 10. The inner ends of these 'set screws' are pointechas shown, and the set screws-are held in "adjusted position 'bv'loek nuts 11. 'Tlie leverhas a cross head 12 atits outer-'end, and an angular extension 13 at the cross 'head, the saidexte'nsion '13 extending at approximately right angles to This cross head '12 has conical the set screws 10 before mentioned, to pivot "silly mount the reproducerlever on the radial extension.

11 needle holder 14 ismounted atthe opposite side of the box from the radial extension. This needle holder 14.- has the usual axial opening for receiving the needle, and the set screw 15 for holdmg the needle in place, and at the opposite end from the axlal opening the needle holder has a cross head 16 and an angular extension 17 extending at approximately a right angle to the needle holder.

A segmental plate 18 is secured to the ring 6 at a point diametrically opposite the radial extension by means of screws or the like, and this plate is recessed at'its center on an arc-Which has the center ofthediaphragmfor its center. The plate 18 carries a pair of alinedbearings 19, through which are threaded set screws 20 similar-to the screws '10 before mentioned. The inner ends of these screws are tapering '01 ;p01nted, as shown, and they are adapted "to engage similarly shaped openings in the ends of the cross head. 1

Each screwhas a lock nut 211a the outer face of the bearing for 'holdin'g the screw fin adjusted position. Thus both the reproducing'lever and the needle holder are pivotally connected to the sound box. The resilient connection between the reproducing lever and the'needle holder is provided by anfarc shaped spring 22. This springha's its ends connected with theextensions 13 and 17 and it will be noticed, referring to Fig. 3, that these extensionsextend well up on to the arms ofthe spring, thusproviding'rigidity at the ends of the spring. p

The plate 18 and the mounting of the needle holder thereonprovides a species'of counter-weight, which steadies the movement of the rep'roducer box under the impulse ofthe needle. The improvedmethod of mounting th r p e only "pro-l vides a soft tone, eliminating disagreeable "scraping, squeaking and mechanical "elements, but 'alsoprovides for increased volume of tone. The movementof the "needle is amplified atthe diaphragm by the connection between the needle holder and i-the reproducer lever. y It will be noticed, referring to Fig. 3, that while thelength of-the extension 13 is about half the length of the reproducing lever 7 the extension 17 is only about onethird thelengtli of theneedle holder 14,1that is, the extension 13 is relatively long as compared with the extension 17 This arrange ment increases the leverage between the needle point and the connection of the lever 7 with the diaphragm. A greater leverage is exspring throughout their length but-only at the point where the screws pass through the spring. Here it Wlll be noticed that each extension has enlargements somewhat 1n the form of washers, which space the spring from the body of the extension.

I claim:

. 1. In reproducers, the combination with the sound box, the reproducing lever and the needle holder, of pivotal mountings at the inner end of the needle holder and at the outer end of the reproducing lever for said 9 needle holder and reproducing lever, the

sound box having a radial extension which carries the pivotal connection of the repro ,ducing lever, and a segmental plate secured to the box at the opposite side from the ex-' tension and extending over the diaphragm to near the center thereoi and carrying the pivotal mounting of the needle holder, and a resilient coimection between said needle holder and reproducing lever at the pivotal connection, said connection comprising a plate spring, one end'of which is rigid with the lever and the other wilh the needle holder, said spring being arched longitudinally, and the needle holder and the reproducing lever having angular extensionslying upon the spring at the ends thereof and rigidly secured thereto.

'2. In reproducers, the combination with the sound box,the reproducing lever and the needle holder, of pivotal mountings at the inner end of the needle holder and at the outer end of the reproducing lever for said needle holder and reproducing lever, the

sound box having a radial extension which 55' carries the pivotal connection of the repro ducing lever, and a segmental plate secured to the box at the opposite side from the extension and extending over the diaphragm-to near the center thereofand carrying the pivotal mounting of the needle holder, and a resilient connection between said needle holder and reproducing lever at the pivotal connection, said connection comprising a plate spring, one end of which is rigid with the lever and the other wlth theneedle holder,

3. In reproducers, the combination with the sound box, the reproducing lever and the needle holder, of pivotal mountings at the inner end of the needle holder and at the outer end of the reproducing lever pivotally supporting said needle holder and reproducing lever at points equally spaced beyond one face of the'sound box, the sound box having a radial extension which carries the pivotal connection of the reproducing lever, and a segmental plate secured to the box at the opposite side from the extension and extending over the diaphragm to near the center thereof'and carrying the pivotal mounting of the needle holder, and a resilient connection in normal condition between said needle holder andreproducinglever at the pivotal mountings, r

In a reproducer, asound box, a repreducinglever, a needle holder, self supporting pivots for the said lever and said needle holder-o'nthe sound box, and a bow shaped spring in normal condition connected at opposite ends to said lever and said holder,

5. In reproducers, the combination-with the sound box, the reproducing lever and the needle holder, of pivotal mountings at the inholder and'reproducinglever secured at its a 1 ends thereto. 1

6. In reprodueers, the combination with the sound box the reproducing lever and the needleholder, of pivotal mountings at the innerend of the needle ,holder and at theouter end of the reproducing lever for said needle holder and reproducing lever each including spaced bearings, and a resilient connection between said needle holder and reproducing lever, secured to the latter between the bearings.

7. In reproducers, the combination with the sound box, the reproducing lever; and the needle holder, of pivotalmountings at the inner end of the needle holder and at the .1

outer end of the reproducing lever for said needle holder and reproducing lever, the sound box'having a radial extension which carries the pivotal connection of the repro ducing lever, and a segmental plate secured to the box at the opposite side from the extension and extending over the diaphragm. to near the center thereof and carrying the pivotal mounting of the needle holder, and a resilient connection in normal condition between said needle holder and reproducing lever.

8,- In reproducers, the combination with the sound box, the reproducing lever and both the needle holder and the reproducing the needle holder, of pivotal mountings at lever having angular extensions for oonnecthe inner end of the needle holder and at the tion with the spring, and the extension of 10 outer end of the reproducing lever for said the reproducer lever being relatively greater needle holder and reproducing lever, a than the extension of the needle holder. spring in normal condition connecting the needle holder and the reproducing lever, JOHN W. KAUFMANN. 

